When a temporarily insane Dr. McCoy accidentally changes history and destroys his time, Kirk and Spock follow him to prevent the disaster, but the price to do so is high.
Episode rating
Cast of episode
- Captain James Tiberius 'Jim' Kirk
- Mister Spock
- Sister Edith Keeler
- Dr. McCoy
- Scott
- Sulu
- Uhura
- Rodent
- Guard
- Galloway
- Lt. Kyle
- Announcer
- Onlooker on Street
- Lieutenant Hadley
- Drunk
- Council Member
- Server
- Onlooker on Street
- Man in Mission
- Man in Mission
- Truck Driver
- Lieutenant Leslie
- Man in Mission
- Onlooker on Street
- Man in Mission